Just finished reading up on Canna pro+... Sounds like fancy potting soil to me lol assuming it's got nutes there as well as that 'first week' stuff, I'd go ahead and give it some PK 13/14 or a bloom feed.
I don't see any reason why not. Looks green enought for the 1 part N to see it through. There could be micronutrients in the other parts that get missed. Hopefully someone who's used the products can tell you 100%.